There’s another reference to the Merryland in 1930, per the LA Times, so it was probably the Merryland first, then changed to Columbia sometime in the thirties, and then lastly the unfortunately named Dorkel Theater, probably in the early forties.

Picture of the Merryland Theatre in 1930, which had just been bought by the 27 yr old David A Miller.the previous owners having run it into the red,and was still showing silent movies,plus 5 Vaudeville acts once a week: View link